Oxford (compact) English dictionary

Macmillan: English dictionary

Chambers Harrap: English dictionary

Collins: English dictionary

Cambridge (advanced learner's dictionary)

Longman: English dictionary

Merriam-Webster (American) meaning , etymology, pronunciation (with sound) & thesaurus  

    Learner's dictionary

    Visual dictionary by topics

American Dictionary of the English Language by Noah Webster, 1828 edition

The Century Dictionary (American, 1881) dictionary & encyclopedia: 500 000 meanings

Roget's Thesaurus: synonyms & broaders

Hyperdic: synonyms & broaders, meanings

Etymonline: etymological dictionary

Word info: etymology of English words derived from Latin and Greek words

Dictionary.com: American dictionaries: Random House, American Heritage...

Wordnik: American dictionaries: American Heritage, Century... & etymology, examples

Dictionary of synonyms & antonyms, Merriam-Webster (1984)

Dictionary of prefixes, suffixes and combining forms, Merriam-Webster (2002)

rhyming dictionary

Encyclopædia Britannica, A Dictionary of Arts, Sciences, Literature and General Information (1911)

Old & Middle English & Modern English

the word of the day (Merriam Webster)

words & expressions of the human body [PDF]

English words of Indian origin (Amerindian)

slang dictionary

The elements of style by William Strunk (1918)

The King's English by Henry Fowler (1908)

verb conjugation

irregular verbs

irregular verbs to search a verb (with sound)

English tenses

English grammar > table of contents

English grammar

Common errors in English usage

English course: grammar, texts & sound (Britich Council)

books about English language: Google books & Internet archive

library: online books

American,& Canadian, Australian, Irish English

Scots

Old & Middle English & Modern English

Germanic languages